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Old 04-30-2020, 11:31 AM   #1
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Greywater tank vents stink under sink

Just bought a 2011 Feather Lite X172. Discovered the air vent for the greywater tank is inside the bath vanity cabinet rather than outside such as on the roof. Pew! Anyone run into this? Whatís the solution? Thanks.
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Old 04-30-2020, 11:48 AM   #2
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I think you are talking about the Studor vent and the ones that most RV companies use are pretty much cheepo. Most replace them fairly early in the game. When working properly they do not allow smells in.

https://www.amazon.com/Studor-20341-...s%2C396&sr=8-3
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Old 04-30-2020, 12:54 PM   #3
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I think you are talking about the Studor vent and the ones that most RV companies use are pretty much cheepo. Most replace them fairly early in the game. When working properly they do not allow smells in.

https://www.amazon.com/Studor-20341-...s%2C396&sr=8-3
X2. Your HTT is getting up there in age, so I am kinda surprised to hear it is stuck, but it may just have a lot of wear, as it opens/closes every time water goes down the drain. You might be able to just unscrew it, rotate the plunger a little bit and exercise the spring a few times.

In reality these valves are really cheap to purchase, and be purchased at any hardware store.

Yours probabaly looks something like this one. https://www.amazon.com/Oatey-39012-A...4&sr=8-1-fkmr1
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Old 04-30-2020, 01:09 PM   #4
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Apparently,they admit air into the plumbing to break the siphon vacuum. No air should come out into the cabin.
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Old 04-30-2020, 01:11 PM   #5
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Thanks, Iíll see if this part is broken. Iím new to RV plumbing. Shouldnít this bad air from the greywater holding tank be vented to the outside of the trailer rather than into the sink vanity? In a house plumbing waste lines are vented to the roof.
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Old 04-30-2020, 01:22 PM   #6
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In a house plumbing waste lines are vented to the roof.
Some rigs have both, just depends on where the roof vent is located on the tank. However STUDOR vents are also used in residential construction, again depending on how the plumbing is run.

https://studor.net/en/pageid/product...mittancevalves
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Old 04-30-2020, 01:23 PM   #7
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Guys - I think I finally understand how this venting works. This is to let air into the plumbing so waste can flow to the holding tank. The holding tank must have itís own vent someplace under the trailer. Thank you three amigos very much, and sorry I was a slow learner.
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Old 04-30-2020, 01:52 PM   #8
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If you can look on your roof you should see 2 vents, one would be for the grey tank, other for the black.
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Old 04-30-2020, 03:16 PM   #9
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That vent should be for the sink so it drains properly, there should still be a main vent from the grey water to the roof. I have 2 grey tanks and a black, it appears they all share one vent through the roof.
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Old 04-30-2020, 03:36 PM   #10
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Besides changing out those little critters I suggest using Happy Camper in the gray tank every once-in-awhile. Grey tanks can be as bad or worse than black for odors due to all of the organic waste that goes into and through them.

Close the drain valve, add the recommended amount of Happy Camper and don't empty the tank until it really needs it. That gives the microbes time to do their job and clean up some of that crude in there. I think you will notice a difference.
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